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/*
* Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otbComputeGainLutFilter_h
#define otbComputeGainLutFilter_h
#include "itkImageToImageFilter.h"
#include "otbImage.h"
namespace otb
{
/** \class ComputeGainLutFilter
* \brief Compute the gain for each pixel value from a histogram
*
* This class implements the second part of the CLAHE algorithm. It's aim
* is to compute a look up table filled with gain that need to be applied
* on the input to match the target histogram. To keep consistency with
* the other parts of the algorithm it needs the minimum and maximum value
* of the input image and also the theorical number of pixel per histogram.
*
* \ingroup OTBContrast
*/
template <class TInputImage , class TOutputImage >
class ITK_EXPORT ComputeGainLutFilter :
public itk::ImageToImageFilter< TInputImage , TOutputImage >
{
public:
/** typedef for standard classes. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef ComputeGainLutFilter Self;
typedef itk::ImageToImageFilter< InputImageType, OutputImageType > Superclass;
typedef itk::SmartPointer< Self > Pointer;
typedef itk::SmartPointer< const Self > ConstPointer;
typedef typename InputImageType::PixelType HistoType;
typedef typename OutputImageType::PixelType LutType;
typedef typename OutputImageType::InternalPixelType OutputPixelType;
typedef typename OutputImageType::RegionType OutputImageRegionType;
/** Method for creation through the object factory. */
itkNewMacro(Self)
/** Run-time type information (and related methods). */
itkTypeMacro(ComputeGainLutFilter, ImageToImageFilter)
/** Get/Set macro to get/set the number of pixel by histogram */
itkSetMacro(NbPixel, unsigned long)
itkGetMacro(NbPixel, unsigned long)
/** Get/Set macro to get/set the minimum value */
itkSetMacro(Min, double)
itkGetMacro(Min, double)
/** Get/Set macro to get/set the maximum value */
itkSetMacro(Max, double)
itkGetMacro(Max, double)
protected:
ComputeGainLutFilter() ;
~ComputeGainLutFilter() override {}
void PrintSelf(std::ostream& os, itk::Indent indent) const override;
void BeforeThreadedGenerateData() override ;
void ThreadedGenerateData(
const OutputImageRegionType & outputRegionForThread ,
itk::ThreadIdType threadId) override ;
private:
ComputeGainLutFilter(const Self &) = delete ;
void operator =(const Self&) = delete ;
/** Post-process the look up tabe to get a gain instead of a simple value */
OutputPixelType PostProcess( unsigned int countMapValue ,
unsigned int countValue ) ;
/** Equalized input histogram regarding the target and filling the
* corresponding look up table */
void Equalized( const HistoType & inputHisto ,
HistoType & targetHisto ,
LutType & lut) ;
/** Create target depending on the number of pixel in the input histogram */
void CreateTarget( const HistoType & inputHisto ,
HistoType & targetHisto ) ;
//TODO Give the opportunity to choose the histogram target
/** Check whether the input histogram has enough pixel to be meaningful */
bool IsValid(const HistoType & inputHisto ) ;
double m_Min;
double m_Max;
double m_Step;
unsigned int m_NbBin;
unsigned long m_NbPixel;
};
// End namespace otb
}
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbComputeGainLutFilter.txx"
#endif
#endif
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